Optimal design of safety technology of nitrogen injection and fire prevention for 8101 working face
In order to solve the problem of large amount of abandoned coal and high risk of spontaneous combustion in the goaf of 8101 working face of Wangping Coal Industry,simulation software was used to simulate the evolution process of overlying rock stress field in the goaf during the mining process,analyze the distribution of goaf strike and dip plastic zone,and clearly divide the"three zones"of horizontal caving zone according to the simulation results.Through comparative analysis,it is concluded that the heat dissipation zone corresponds to the natural accumulation area,the oxidation zone corresponds to the broken accumulation zone,and the asphyxiation zone corresponds to the com-pacted stability zone.The distribution of oxygen concentration in goaf under different nitrogen injection conditions was simulated,and the optimal nitrogen injection position was 40 m and the opti-mal nitrogen injection amount was 1 400 m3/h.The nitrogen injection fire safety technology of non-spaced nitrogen injection process was applied to the site test.The results show that the oxygen content at the return air surface of the goaf decreases significantly at 40 m,and the maximum carbon monox-ide content in the goaf is not more than 100 mg/m3.
residual coalcave-down compactionspontaneous combustion"three zone"nitrogen injec-tion for fire preventionsafety technology
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